<template>
  <div class="app-header-sticky" :class="{show:y>=78}">
    <div class="container" v-show="y>=78">
      <router-link class="logo" to="/" />
      <AppHeaderNav />
      <div class="right">
        <router-link to="/">品牌</router-link>
        <router-link to="/">专题</router-link>
      </div>
    </div>
  </div>
</template>

<script>
// import { onMounted, ref } from 'vue'
import { useWindowScroll } from '@vueuse/core'
import AppHeaderNav from './app-header-nav.vue'
export default {
  name: 'AppHeaderSticky',
  components: {
    AppHeaderNav
  },
  setup() {
    // 记录y轴卷曲的高度
    // const y = ref(0)
    // // 当你页面滚动的时候更新它
    // onMounted(() => {
    //   window.onscroll = () => {
    //     const scrollTop = document.documentElement.scrollTop
    //     y.value = scrollTop
    //   }
    // })
    // useWindowScroll() 是@vueuse/core提供的api可返回当前页面滚动时候蜷曲的距离。x横向，y纵向
    // vue3.0组合API提供了更多逻辑代码封装的能力。@vueuse/core 基于组合API封装好用的工具函数
    const { y } = useWindowScroll()
    return { y }
  }
}
</script>

<style lang="less" scoped>
.app-header-sticky {
  width: 100%;
  height: 80px;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 999;
  background-color: #fff;
  border-bottom: 1px solid #e4e4e4;
  transform: translateY(-100%);
  opacity: 0;
  &.show {
    transition: all .3s linear;
    transform: none;
    opacity: 1;
  }
  .container {
    display: flex;
    align-items: center;
  }
  .logo {
    width: 200px;
    height: 200px;
    background: url('../assets/images/logo.png') no-repeat right 2px;
    background-size: 160px auto;
  }
  .right {
    width: 220px;
    display: flex;
    text-align: center;
    padding-left: 40px;
    border-left: 2px solid @xtxColor;
  }
  a {
    width: 38px;
    margin-right: 40px;
    font-size: 16px;
    line-height: 1;
    &:hover {
      color: @xtxColor;
    }
  }
}
</style>
